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Peer Reviewed
See detailComparison of transport in lysimeters with undisturbed loamy sand and silty soil using non invasive imaging with electrical resistivity tomography.
Garré, Sarah ULg; Koestel, Johannes; Vanderborght, Jan et al

in Geophysical Research Abstracts (2009, April 23)

Detailed reference viewed: 16 (4 ULg)
Peer Reviewed
See detailComparison of transport in lysimeters with undisturbed loamy sand and silty soil using non-invasive imaging with electrical resistivity tomography
Garré, Sarah ULg; Koestel, Johannes; Javaux, Mathieu et al

Conference (2009, September)

Detailed reference viewed: 25 (2 ULg)
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See detailComparison of transrectal ultrasound and plasma pregnancy-associated glycoprotein (PAG) as pregnancy tests of reindeer
Savela, H.; Vahtiala, S.; Lindeberg, H. et al

in Proceedings of the 16th International Congress on Animal Reproduction (2008)

Detailed reference viewed: 10 (0 ULg)
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See detailA comparison of triangle and quadrangle finite elements for large strain elastoplastic formulations
KARASEVA, Olga; Stainier, Laurent ULg; Careglio, C. et al

in Proceedings of ACOMEN’2008, Advanced Computational Methods in Engineering (2008)

The paper presents a comparative study of different elastoplastic large strain formulations used in research groups in Mendoza and Li`ege. The comparison is focused on a few academic standardized problems ... [more ▼]

The paper presents a comparative study of different elastoplastic large strain formulations used in research groups in Mendoza and Li`ege. The comparison is focused on a few academic standardized problems, in particular necking of a cylindrical bar in tension. Stress distribution at necking section, as well as load histories are analyzed for all three formulations. Two other test cases consider bending of the so-called ”Greco” beam and upsetting of a cylinder. Numerical results show that all approaches yield very similar results and thus are equally valid. Furthermore, quadratic 6-noded triangles provide a good alternative to bilinear quadrangles, even if sometimes they appear to be more sensitive to big distorsions. [less ▲]

Detailed reference viewed: 114 (6 ULg)
See detailComparison of troponin I and troponin T changes after PTCA
Chapelle, Jean-Paul ULg

Conference (1999, February)

Detailed reference viewed: 3 (0 ULg)
Peer Reviewed
See detailComparison of two automated solid-phase extraction methods for the HPLC determination of nifedipine in human plasma with electrochemical detection
Maes, P.; Sibenaler-Dechamps, R.; Zimmer, C. et al

in Journal de Pharmacie de Belgique (1992), 47

Detailed reference viewed: 7 (1 ULg)
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See detailComparison of two drainage flow situations on a gentle forested slope
Heinesch, Bernard ULg; Yernaux, Michel ULg; Aubinet, Marc ULg

Poster (2010)

Drainage flows generated on a gentle slope in stable conditions were analysed at the forested site of Vielsalm (Belgium). Two distinct situations were encountered, one corresponding to vertical ... [more ▼]

Drainage flows generated on a gentle slope in stable conditions were analysed at the forested site of Vielsalm (Belgium). Two distinct situations were encountered, one corresponding to vertical convergence, characterised by a negative vertical velocity at the canopy top, the other corresponding to an equilibrium situation without any vertical movement. The causes of these two distinct flow patterns were analysed. Moreover, combined measurements of vertical velocity above the canopy and horizontal velocity divergence below the canopy were found to comply with the continuity equation: an acceleration of the horizontal flow was indeed observed in the trunk-space in convergence situations while not in equilibrium conditions. These measurements combined with those of the horizontal [CO2] gradient below the canopy were found to met the dilution hypothesis suggested by Aubinet et al.(2003): the horizontal [CO2] gradient was negative in convergence situations while slightly positive in equilibrium conditions. The existence of such patterns allows us to confirm the coherence of advection observations made at the site and help to better understand the mechanisms responsible of night flux exchanges at work in stable conditions in complex terrains. Nevertheless, difficulties were met when trying to obtain reliable estimates of the advection transport terms. The estimation of the vertical velocity in the trunk-space obtained by using the divergence measurements refuted the hypothesis of linearity of the vertical profile of vertical velocity, assumption usually used when computing vertical advection. This problem resulted in a great uncertainty on vertical advection which did not allowed to improve the night-flux estimation by adding advection terms to the turbulent flux and the storage. [less ▲]

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Peer Reviewed
See detailComparison of two FFPE preparation methods using label-free shotgun proteomics: Application to tissues of diverticulitis patients.
QUESADA CALVO, Florence ULg; Bertrand, Virginie ULg; Longuespée, Rémi ULg et al

in Journal of proteomics (2014), 112C

Formalin-fixed paraffin-embedded (FFPE) specimens of patients are useful sources of materials for clinical research and have recently gained interest for use in the discovery of clinical proteomic ... [more ▼]

Formalin-fixed paraffin-embedded (FFPE) specimens of patients are useful sources of materials for clinical research and have recently gained interest for use in the discovery of clinical proteomic biomarkers. However, the critical step in this field is the ability to obtain an efficient and repeatable extraction using the limited quantities of material available for research in hospital biobanks. This work describes the evaluation of the peptide/protein extraction using FFPE sections treated by the following two methods before shotgun proteomic analysis: a commercial solution (FFPE-FASP) (filter aided sample preparation) and an antigen retrieval-derived protocol (On Slice AR). Their efficiencies and repeatabilities are compared using data-independent differential quantitative label-free analysis. FFPE-FASP was shown to be globally better both qualitatively and quantitatively than On Slice AR. FFPE-FASP was tested on several samples, and differential analysis was used to compare the tissues of diverticulitis patients (healthy and inflammatory tissues). In this differential proteomic analysis using retrospective clinical FFPE material, FFPE-FASP was reproducible and provided a high number of confident protein identifications, highlighting potential protein biomarkers. BIOLOGICAL SIGNIFICANCE: In clinical proteomics, FFPE is an important resource for retrospective analysis and for the discovery of biomarkers. The challenge for FFPE shotgun proteomic analysis is preparation by an efficient and reproducible protocol, which includes protein extraction and digestion. In this study, we analyzed two different methods and evaluated their repeatabilities and efficiencies. We illustrated the reproducibility of the most efficient method, FFPE-FASP, by a pilot study on diverticulitis tissue and on FFPE samples amount accessible in hospital biobanks. These data showed that FFPE is suitable for use in clinical proteomics, especially when the FFPE-FASP method is combined with label-free shotgun proteomics as described in the workflow presented in this work. [less ▲]

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See detailComparison of two immunoassays for oxidized LDL determination
Le Goff, Caroline ULg; Haleng, Jeanine ULg; Denooz, André ULg et al

in Annales de Biologie Clinique (2009), 67(1),

Detailed reference viewed: 22 (7 ULg)
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Peer Reviewed
See detailComparison of two immunoassays for quantitative measurement of oxydized-LDL
Le Goff, Caroline ULg; Haleng, Jeanine ULg; Chapelle, Jean-Paul ULg

in Immuno-Analyse & Biologie Spécialisée [=IBS] (2009), 24

Detailed reference viewed: 14 (3 ULg)
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Peer Reviewed
See detailComparison of two inverse analysis techniques for learning deep excavation response
Hashash, Youssef; Levasseur, Séverine ULg; Osouli, Abdolreza et al

in Computers & Geotechnics (2010), 37

Performance observation is a necessary part of the design and construction process in geotechnical engineering. For deep urban excavations, empirical and numerical methods are used to predict potential ... [more ▼]

Performance observation is a necessary part of the design and construction process in geotechnical engineering. For deep urban excavations, empirical and numerical methods are used to predict potential deformations and their impacts on surrounding structures. Two inverse analysis approaches are described and compared for an excavation project in downtown Chicago. The first approach is a parameter optimization approach based on genetic algorithm (GA). GA is a stochastic global search technique for optimizing an objective function with linear or non-linear constraints. The second approach, self-learning simulations (SelfSim), is an inverse analysis technique that combines finite element method, continuously evolving material models, and field measurements. The optimization based on genetic algorithm approach identifies material properties of an existing soil model, and SelfSim approach extracts the underlying soil behavior unconstrained by a specific assumption on soil constitutive behavior. The two inverse analysis approaches capture well lateral wall deflections and maximum surface settlements. The GA optimization approach tends to overpredict surface settlements at some distance from the excavation as it is constrained by a specific form of the material constitutive model (i.e. hardening soil model); while the surface settlements computed using SelfSim approach match the observed ones due to its ability to learn small strain non-linearity of soil implied in the measured settlements. [less ▲]

Detailed reference viewed: 62 (5 ULg)
Peer Reviewed
See detailA Comparison of Two Learning and Teaching Centres in the E.U. Area : Strategies for Quality Enhancement of Teaching and Learning
Vigentini, Lorenzo; Leduc, Laurent ULg

in Nygaard, Claus; Courtney, Nigel; Bartholomew, Paul (Eds.) Quality Enhancement of University Teaching and Learning (2013)

This chapter portrays the particular realities and activities of two Centres devoted to the support and enhancement of teaching in two European Universities, respectively from Scotland and Belgium. After ... [more ▼]

This chapter portrays the particular realities and activities of two Centres devoted to the support and enhancement of teaching in two European Universities, respectively from Scotland and Belgium. After providing an overview of the conceptualization of quality used, we introduce the comparison of the strategic priorities and activities at the light of this theoretical framework. The details emerging from the description of the origins, objectives and the actions implemented affords to derive common denominators and identify key differences in the ways in which the two Universities support academic development, pedagogical innovation and the alignment to EU regulations. The comparison offers a rich overview of the potential of such units to achieve institutional strategic goals to benefit both academics and students and ultimately enhance learning and teaching. [less ▲]

Detailed reference viewed: 29 (3 ULg)
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Peer Reviewed
See detailComparison of two methods currently used to determine the interaction between cyclodextrins and drugs: phase solubility diagrams and NMR spectroscopy
Piel, Géraldine ULg; Moutard, Stephane; Perly, Bruno et al

in Journal of Drug Delivery Science and Technology (2004), 14(1, JAN-FEB), 87-91

Two methods usually used in the literature to determine stability constant values (Kc) of cyclodextrin complexes were compared: the phase solubility diagram and NMR spectroscopy. Two model drugs were used ... [more ▼]

Two methods usually used in the literature to determine stability constant values (Kc) of cyclodextrin complexes were compared: the phase solubility diagram and NMR spectroscopy. Two model drugs were used to determine limitations of both techniques: betamethasone and miconazole, with three cyclodextrins: beta-cyclodextrine (betaCD), dimethylated-betaCD (Dimeb) and trimethylated-betaCD (Trimeb). This study shows that both techniques can give the same Kc value if they are used in exactly the same conditions with well defined cyclodextrins. As a matter of fact, if the degree of substitution of cyclodextrin is not well defined (as it is often the case with Dimeb), results are biased. This study also shows that when interactions between both molecules are weak (< 1000 M-1), stability constants can not be determined by NMR due to low chemical shift variations. The limitations of the phase solubility diagram method are an oversimplification of the solubility data which can lead to large errors in the calculation of the stability constant values. Moreover, this method is time and material consuming. [less ▲]

Detailed reference viewed: 65 (7 ULg)
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Peer Reviewed
See detailA comparison of two methods for pulmonary function testing in horses with upper and lower airway obstruction
Van Erck, Emmanuelle; Duvivier, D. H.; Art, Tatiana ULg et al

Poster (1997, October 24)

Detailed reference viewed: 29 (0 ULg)
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Peer Reviewed
See detailComparison of Two Methods, UHPLC-UV and UHPLC-MS/MS, for the Quantification of Polyphenols in Cider Apple Juices
Verdu, Cindy ULg; Gatto, Julia; Freuze, Ingrid et al

in Molecules (2013), 18/9

Abstract: The aim of this study was to develop faster and more efficient phenotyping methods for in-depth genetic studies on cider apple progeny. The UHPLC chromatographic system was chosen to separate ... [more ▼]

Abstract: The aim of this study was to develop faster and more efficient phenotyping methods for in-depth genetic studies on cider apple progeny. The UHPLC chromatographic system was chosen to separate polyphenolic compounds, and quantifications were then simultaneously performed with a UV-PDA detector and an ESI-triple quadrupole mass analyzer (SRM mode). Both quantification methods were validated for 15 major compounds using two apple juice samples, on the basis of linearity, limits of detection and quantification, recovery and precision tests. The comparison between UV and SRM quantifications in 120 different samples of a cider apple progeny showed an excellent correlation for major compounds quantified with both methods. However, an overestimation was revealed for five compounds with the UV detector and the mass analyzer. Co-elution and matrix effects are discussed to explain this phenomenon. SRM methods should therefore be considered with restrictions in some cases for quantification measurements when several phenolic compounds are simultaneously quantified in complex matrices such as apple juices. For both methods, analyses were carried out over short periods of time while maintaining a high quality for the simultaneous quantification of phenolic compounds in apple juice. Each method is relevant for more in-depth genetic studies of the polyphenol content of apple juice. [less ▲]

Detailed reference viewed: 37 (16 ULg)
Peer Reviewed
See detailComparison of two novel control strategies for a closed loop micromachined tunnelling accelerometer
Gaura; E.; Kraft, Michael ULg

in Proc. 4rd Conf. on Modeling and Simulation of Microsystems (2001, March)

Detailed reference viewed: 13 (0 ULg)